Model 647A
Dynamic Microphone
TAE
DESCRIPTION AND APPLICATIONS
The Electro- Voice Model 647A lavalier microphone
is a small, light-weight, dynamic microphone with
wide-range frequency response. This slim, un-
obtrusive microphone may be held in the hand,
attached to alavalier cord, or mountedon a stand,
using the swivel stand clamp supplied. It is ex-
cellent for use in audience participation and panel
shows, church pulpits, etc., wherever microphone
concealment, individual mobility, or free move-
mentof the hands is desired. No closely associated
auxiliary equipment is required.
The Model 647 A microphone features the exclusive
E-V Acoustalloy® diaphragm. This nonmetallic
diaphragm withstands high humidity, temperature
extremes, corrosive effects of gsaltair, and severe
mechanical shocks. Itis practically indestructible
with normal use.
The 647A is equipped with three specially designed
accessories intended to increase the usefulness and
mounting convenience of the microphone - a newly
designed lavalier cord assembly, a belt clip, and
stand mounting clamp. Thelavalier cord assembly
is supplied attached to the microphone, ready for
use. Note that the flexible plastic cord coupler
may be removed from the microphone, if desired,
by firmly pulling itover the frontof the microphone,
Alternately, the coupler may be pushed free of the
microphone and allowed to slide down the cable,
the neck cord being retained separately for future
use, In this case, the cord coupler will be re-
tained permanently and cannot be lost since it can-
not escape from either end of the cable. (In the
event the cord is misplaced, anordinary shoestring
may be employed after simply tying a knot in each
end.)
The belt clip, when used in conjunction with the
lavalier cord assembly, provides effective control
FEATURES
Miniaturized high quality dynamic
Easy to use
Unobtrusive
Rugged
of cable placement and prevents unwanted mechani-
cal noise from being transmitted up the cable to the
microphone. After inserting the cable in the clip
as shown in Fig. 1, simply attach it to the belt at
one side. It may also be clipped over the edge of
a pocket, etc.
The stand mounting clamp may be used to attach
the 647 À to any conventional microphone stand with
5/8"-27 thread. The built-in swivel permits ad-
justment of the microphone to any desired angle.
The design of the clamp allows the microphone to
be inserted or removed readily as desired.
SPECIFICATIONS
Element: Dynamic
Frequency Response: 60 to 12,000 eps. (Fig. 2)
Polar Pattern: Omnidirectional (Fig. 3)
Impedance: Hi-Z or 150 ohms (specify when
ordering)
Output Level: Hi-Z, -60 db
(0 db = 1 volt/dyne/cm?2)
150 ohm, -60 db
(0 db = 1 mw/10 dynes/em”)
EIA Sensitivity Rating: -155 db
Diaphragm: Electro- Voice Acoustalloy®
Dimensions: Diameter, 3/4 inches
Length, 8-5/8 inches
(Fig. 1)
Finish: Non-reflecting gray
Net Weight: 2 ounces, less cable
Cable: 18 ft., two conductor shielded,
rubber jacketed
Cable Connector: No connector at microphone
terminal
Accessories Supplied: Neck cord assembly, belt
clip, stand clamp.
Warranty: The 647A microphone is guaranteed
for life against defects in workman-
ship and materials.
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ARCHITECTS’ AND ENGINEERS’
SPECIFICATIONS
The microphone shall be the Electro- Voice Model
647A or equivalent. The microphone shall be an
omnidirectional, dynamic type with nonmetallic
Acoustalloydiaphragm. The microphone shall have
a magnetic shield to prevent dust and magnetic
particles from reaching the diaphragm. A uniform
response from 60 to 12,000 cps shall be obtained.
Impedance shall be (specify 150 ohms or Hi-Z). Low
impedance line shall be balanced to ground and
phased. The output level shall be -60 db with 0 db
equalling 1 mw/10dynes/cm? at low impedance and
-60 db with 0 db equalling 1 volt/dyne/em?* at high
impedance. ETA sensitivity rating shall be -155 db,
The microphone shall have a diameter of 3/4 inch,
a length of 3-5/8 inches, and a net weight of
2 ounces without the cable or neck cord assembly.
1 Ss Finish of the microphone shall be non-reflecting
| gray. A lavalier cord, belt clip, and swivel stand
clamp shall be supplied.
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